7Schein, E. H., Organizational Psychology, Englewood Cliffs: Prentice-Hall, 1980.
8Organ D W. , Organizational chizenship behavior : The good soldier syndrome, Lexington, MA: Lexington Books, 1988.
9Coyle-Shapiro, J and Kessler, "Reciprocity through the lens of the psychological contract: Employee and employer perspectives", European Journal of Work and Organizational Psychology, 2002, Vol. 11 (1), pp.1- 18.
10Hui C, Lee C, Rousseau D M., "Psychological contract and organizational citizenship behavior in China: Investigating generalizability and instrumentality", Journal of Applied Psychology, 2004, Vol. 89 (2) ,pp.311 - 321.